John and his wife were living in a rural place. On a particular day, John's wife fell ill and he called the local doctor. When the doctor picked up, he said, "Doctor, my wife is ill. She might have appendicitis."
"This can't be possible! I took out her appendix two years ago myself," the doctor explained.
When diagnosed, John's wife was found to have appendicitis. How can this be possible?
The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.
What can a student say to prevent his being expelled from school?